You know when something just fights you for hours....
So, dug out a PN532.
Connected it via I2C (with/without pullups)... nope. Didn't work
Tried Serial. Nope.
Finally off the start line using SPI (yes, I did change the onboard DIP switches).
Managed to read some Mifare cards using the Adafruit_PN532 library. Also cleared the cards.
OK. Fine
Now, from what I understand, these cards are 4 sectors, containing 4 blocks of 16 bytes.
The first 5 bytes of block 0 holds 4x UID and a checksum.
The first 3 blocks of each sector can hold information.
But, I can't find in the examples how to write to these blocks. Can anyone point me in the right direction. Bearing in mind I appear to be thick these days.
Thanks